Pile-supported Wharves Subjected to Combined Inertial and Lateral Ground Deformation Loads in Earthquakes

地震中承受惯性和横向地面变形联合荷载的桩支撑码头

• 批准号: 2153282
• 负责人: Arash Khosravifar
• 金额: $ 39.97万
• 依托单位: Portland State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2153282&HistoricalAwards=false
• 关键词: Pile; supported; Wharves; Subjected; Combined

This award will improve the resilience of maritime transportation systems in earthquakes, including ports, terminals, and Navy facilities which are key components of economic prosperity, emergency response, and national security. In addition, ports are often designated centers for post-earthquake staging and relief efforts. However, seismic evaluation studies of port structures often encounter a knowledge gap related to soil-foundation-structure interaction in soils that are susceptible to liquefaction – a phenomenon that causes severe softening of soils in earthquakes. The knowledge gap becomes even wider for foundations that are supported in silty soils (commonly encountered at port facilities) as there is no consensus in the geotechnical community on how to predict the behavior of silty soils in earthquakes. This research will address these knowledge gaps by performing a series of advanced physical experiments and numerical simulations. The findings of this research will result in safer, more resilient maritime transportation systems. Close collaborations with industry partners will ensure that the knowledge produced in this study will benefit the broader engineering community. Characterizing the behavior of silty soils in earthquakes will have a significant effect in assessing, and reducing, the risks associated with an imminent Magnitude 9 Cascadia Subduction Zone earthquake in the Pacific Northwest of the U.S. with substantial economical and societal impacts. The research will also be complemented by a partnership with the LSAMP program at Portland State University to help enhance STEM education with emphasis on diversity. This research has two specific objectives: (1) to investigate a collapse mechanism due to incremental yielding in in-ground pile plastic hinges when subjected to many cycles of loading in long-duration earthquakes, and (2) to quantify the interaction of inertial and kinematic loads on piles with respect to various ground motion characteristics, pile properties, soil profiles, and soil properties. These objectives will be achieved by performing a series of large-scale geotechnical centrifuge tests at the Natural Hazards Engineering Research Infrastructure (NHERI) facility at UC Davis combined with numerical parametric simulations. The results of this research will provide an in-depth understanding of the interaction of inertial and kinematic loads on piles in liquefiable soils which are needed for seismic evaluation studies of new and existing ports as well as other pile-supported structures including highway bridges, buildings and nearshore structures.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项将提高海上运输系统在地震中的恢复能力，包括港口、码头和海军设施，它们是经济繁荣、应急响应和国家安全的关键组成部分。此外，港口往往被指定为震后集结和救灾工作的中心。然而，港口结构的地震评估研究经常遇到与易液化土壤中的土壤-基础-结构相互作用相关的知识差距，这种现象会导致地震中土壤严重软化。对于粉质土壤（港口设施中常见）支撑的地基来说，知识差距变得更大，因为岩土技术界对于如何预测地震中粉质土壤的行为尚未达成共识。这项研究将通过进行一系列先进的物理实验和数值模拟来解决这些知识差距。这项研究的结果将带来更安全、更有弹性的海上运输系统。与行业合作伙伴的密切合作将确保本研究中产生的知识将使更广泛的工程界受益。表征地震中粉质土壤的行为将对评估和减少与美国太平洋西北部即将发生的 9 级卡斯卡迪亚俯冲带地震相关的风险产生重大影响，该地震会产生重大的经济和社会影响。该研究还将得到与波特兰州立大学 LSAMP 项目的合作补充，以帮助加强强调多样性的 STEM 教育。这项研究有两个具体目标：(1) 研究长期地震中多次荷载循环时地下桩塑性铰链屈服增量导致的倒塌机制；(2) 量化桩上惯性荷载和运动荷载与各种地面运动特性、桩特性、土壤剖面和土壤特性的相互作用。这些目标将通过在加州大学戴维斯分校的自然灾害工程研究基础设施 (NHERI) 设施中进行一系列大规模岩土离心机测试并结合数值参数模拟来实现。这项研究的结果将提供对可液化土壤中桩的惯性和运动载荷相互作用的深入了解，这是新港口和现有港口以及其他桩支撑结构（包括公路桥梁、建筑物和近岸结构）的地震评估研究所需要的。该奖项反映了 NSF 的法定使命，并通过使用基金会的知识和技能进行评估，被认为值得支持。 更广泛的影响审查标准。